lily/volta-spanner.cc

   1 /*
   2   volta-spanner.cc -- implement Volta_spanner
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2000 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9
  10 #include "box.hh"
  11 #include "debug.hh"
  12 #include "font-interface.hh"
  13 #include "molecule.hh"
  14 #include "paper-column.hh"
  15 #include "paper-def.hh"
  16 #include "text-item.hh"
  17 #include "volta-spanner.hh"
  18 #include "group-interface.hh"
  19 #include "side-position-interface.hh"
  20 #include "directional-element-interface.hh"
  21
  22
  23 void
  24 Volta_spanner::set_interface (Score_element*me)
  25 {
  26 }
  27
  28 /*
  29   this is too complicated. Yet another version of side-positioning,
  30   badly implemented.
  31
  32   --
  33
  34   * Should look for system_start_delim to find left edge of staff.
  35
  36 */
  37
  38 MAKE_SCHEME_CALLBACK(Volta_spanner,brew_molecule,1);
  39 SCM
  40 Volta_spanner::brew_molecule (SCM smob)
  41 {
  42   Score_element *me = unsmob_element (smob);
  43   Link_array<Item> bar_arr
  44     = Pointer_group_interface__extract_elements (me, (Item*)0, "bars");
  45
  46   if (!bar_arr.size ())
  47     return SCM_EOL;
  48
  49   bool no_vertical_start = false;
  50   bool no_vertical_end = to_boolean (me->get_elt_property ("last-volta"));
  51   Spanner *orig_span =  dynamic_cast<Spanner*> (me->original_l_);
  52   if (orig_span && (orig_span->broken_into_l_arr_[0] != (Spanner*)me))
  53     no_vertical_start = true;
  54   if (orig_span && (orig_span->broken_into_l_arr_.top () != (Spanner*)me))
  55     no_vertical_end = true;
  56
  57 #if 0
  58   // FIXME
  59   if (bar_arr.top ()->me->get_elt_property (type_str_.length_i () > 1)
  60     no_vertical_end = false;
  61 #endif
  62
  63   Real staff_space = me->paper_l ()->get_var ("staffspace");
  64   Real staff_thick = me->paper_l ()->get_var ("stafflinethickness");
  65   Real half_space = staff_space / 2;
  66
  67   /*
  68     the volta spanner is attached to the bar-line, which is moved
  69     to the right. We don't need to compensate for the left edge.
  70    */
  71   Real left = 0.0;
  72   Real w = dynamic_cast<Spanner*>(me)->spanner_length () - left - half_space;
  73   Real h = staff_space * gh_scm2double (me->get_elt_property ("height"));
  74   Real t = staff_thick * gh_scm2double (me->get_elt_property ("thickness"));
  75
  76   /*
  77     ugh: should build from line segments.
  78    */
  79   SCM at = (gh_list (ly_symbol2scm ("volta"),
  80                      gh_double2scm (h),
  81                      gh_double2scm (w),
  82                      gh_double2scm (t),
  83                      gh_int2scm (no_vertical_start),
  84                      gh_int2scm (no_vertical_end),
  85                      SCM_UNDEFINED));
  86
  87   Box b (Interval (0, w), Interval (0, h));
  88   Molecule mol (b, at);
  89   SCM text = me->get_elt_property("text");
  90   SCM properties = gh_list (me->mutable_property_alist_, me->immutable_property_alist_,SCM_UNDEFINED);
  91   Molecule num = Text_item::text2molecule (me, text, properties);
  92
  93   mol.add_at_edge (X_AXIS, LEFT, num, - num.extent (X_AXIS).length ()
  94                    - staff_space);
  95   mol.translate_axis (left, X_AXIS);
  96   return mol.create_scheme();
  97 }
  98
  99
 100 void
 101 Volta_spanner::add_bar  (Score_element *me, Item* b)
 102 {
 103   Pointer_group_interface::add_element(me, "bars",b);
 104   Side_position::add_support (me,b);
 105   add_bound_item (dynamic_cast<Spanner*>(me), b);
 106 }
 107
 108 void
 109 Volta_spanner::add_column (Score_element*me, Score_element* c)
 110 {
 111   Side_position::add_support (me,c);
 112 }